Enigmatic traces in infaunal bivalves from the late Quaternary of Argentina, Southwestern Atlantic. Bioerosion, bioclaustration or nothing?

Ichnological investigations were carried out on late Quaternary shells of the intertidal deep infaunal bivalve Tagelus plebeius (Lightfoot, 1786) found along the southwestern Atlantic, between Uruguay and the southernmost Buenos Aires Province in Argentina. Analyses reveal distinctive marks that are...

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Autores principales: Richiano, Sebastián Miguel, Aguirre, Marina Laura, Farinati, Ester Amanda, Davies, Karen, Castellanos, Ignacio, Gómez Peral, Lucía Elena
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2018
Materias:
Geología
Bioclaustration
Biotic interactions
Bivalve
Late quaternary
Southwestern Atlantic
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/101973
https://ri.conicet.gov.ar/11336/94470
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-101973
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Bioclaustration
Biotic interactions
Bivalve
Late quaternary
Southwestern Atlantic
spellingShingle Geología
Bioclaustration
Biotic interactions
Bivalve
Late quaternary
Southwestern Atlantic
Richiano, Sebastián Miguel
Aguirre, Marina Laura
Farinati, Ester Amanda
Davies, Karen
Castellanos, Ignacio
Gómez Peral, Lucía Elena
Enigmatic traces in infaunal bivalves from the late Quaternary of Argentina, Southwestern Atlantic. Bioerosion, bioclaustration or nothing?
topic_facet Geología
Bioclaustration
Biotic interactions
Bivalve
Late quaternary
Southwestern Atlantic
description Ichnological investigations were carried out on late Quaternary shells of the intertidal deep infaunal bivalve Tagelus plebeius (Lightfoot, 1786) found along the southwestern Atlantic, between Uruguay and the southernmost Buenos Aires Province in Argentina. Analyses reveal distinctive marks that are spread on the outer shell surface only. The marks are regular-unbranched-elongate, perpendicular to the outer shell growth lines, with deflections on the margins, never interconnected, without bifurcations, conforming bottom-up constructions. They occur in hundreds of specimens from many samples taken from sediments ranging in age from the late Pleistocene to the Recent. These marks have never been reported or described for this species and their origin and formation remain elusive. We describe these traces thoroughly and we propose an explanation for their preservation on about half the shells examined. Potential destructive boring structures (excavated from outside-in) or bioerosion activities by other macro- or micro-organisms are dismissed. These antimarginal asymmetric traces point instead to a process of constructive bioclaustrations (grown from the bottom-up) produced in situ during the life of the bivalve by unknown symbiont organisms. Additionally, the regular pattern observed for the marks exclude host growth as a consequence of abiotic/extrinsic causes. From a palaeoecological perspective, these structures suggest a biotic interaction that was hitherto undescribed neither for bivalves nor for the late Quaternary of the southwestern Atlantic.
format Articulo
Preprint
author Richiano, Sebastián Miguel
Aguirre, Marina Laura
Farinati, Ester Amanda
Davies, Karen
Castellanos, Ignacio
Gómez Peral, Lucía Elena
author_facet Richiano, Sebastián Miguel
Aguirre, Marina Laura
Farinati, Ester Amanda
Davies, Karen
Castellanos, Ignacio
Gómez Peral, Lucía Elena
author_sort Richiano, Sebastián Miguel
title Enigmatic traces in infaunal bivalves from the late Quaternary of Argentina, Southwestern Atlantic. Bioerosion, bioclaustration or nothing?
title_short Enigmatic traces in infaunal bivalves from the late Quaternary of Argentina, Southwestern Atlantic. Bioerosion, bioclaustration or nothing?
title_full Enigmatic traces in infaunal bivalves from the late Quaternary of Argentina, Southwestern Atlantic. Bioerosion, bioclaustration or nothing?
title_fullStr Enigmatic traces in infaunal bivalves from the late Quaternary of Argentina, Southwestern Atlantic. Bioerosion, bioclaustration or nothing?
title_full_unstemmed Enigmatic traces in infaunal bivalves from the late Quaternary of Argentina, Southwestern Atlantic. Bioerosion, bioclaustration or nothing?
title_sort enigmatic traces in infaunal bivalves from the late quaternary of argentina, southwestern atlantic. bioerosion, bioclaustration or nothing?
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/101973
https://ri.conicet.gov.ar/11336/94470
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